TOKYO — Fuji TV was Japan’s top-rated network in 2008 in all three major time periods, according to figures from the Video Research ratings agency.Fuji took the ratings triple crown for the fifth year in a row, beating the other four commercial webs and pubcaster NHK. Fuji’s average rating for 2008 in what is called locally the golden time (7 p.m. to 10 p.m.) was 13.3%; it was 13.4% in primetime (7 p.m. to 11 p.m.); and 8.5% in the all-day category (6 a.m. to midnight). NHK finished second in golden time thanks to its coverage of the Beijing Olympics while Nippon Television Network was second in primetime. Fuji held on to its No. 1 rank due to its hit variety shows.